KR20170047751A - Device and method of re-liquefying boil-off gas - Google Patents

Device and method of re-liquefying boil-off gas Download PDF

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Publication number
KR20170047751A
KR20170047751A KR1020150148207A KR20150148207A KR20170047751A KR 20170047751 A KR20170047751 A KR 20170047751A KR 1020150148207 A KR1020150148207 A KR 1020150148207A KR 20150148207 A KR20150148207 A KR 20150148207A KR 20170047751 A KR20170047751 A KR 20170047751A
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KR
South Korea
Prior art keywords
gas
compressor
compressors
evaporation
evaporated
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Application number
KR1020150148207A
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Korean (ko)
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KR102426548B1 (en
Inventor
김인웅
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대우조선해양 주식회사
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Application filed by 대우조선해양 주식회사 filed Critical 대우조선해양 주식회사
Priority to KR1020150148207A priority Critical patent/KR102426548B1/en
Priority to PCT/KR2016/011776 priority patent/WO2017069520A1/en
Priority to CN201680041929.6A priority patent/CN107848604A/en
Priority to US15/743,633 priority patent/US20180216876A1/en
Priority to JP2018517114A priority patent/JP2018517111A/en
Publication of KR20170047751A publication Critical patent/KR20170047751A/en
Application granted granted Critical
Publication of KR102426548B1 publication Critical patent/KR102426548B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F25J1/0025—Boil-off gases "BOG" from storages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/14—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed pressurised
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
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    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
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    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
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    • F25J1/0245—Different modes, i.e. 'runs', of operation; Process control
    • F25J1/0248—Stopping of the process, e.g. defrosting or deriming, maintenance; Back-up mode or systems
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    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
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    • F25J2230/30—Compression of the feed stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/60—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being hydrocarbons or a mixture of hydrocarbons

Abstract

The present invention discloses an apparatus and method for re-liquefying evaporated gas. In a case where a plurality of compressors are operated to compress the evaporated gas, even if the amount of evaporated gas supplied to each of the plurality of compressors is not distributed equally, a function for re-liquefying evaporated gas can be shown. To achieve this, according to the present invention, lines where evaporated gas flows are arranged independently from each other so as not to mix the evaporated gas inside a re-liquefying device.

Description

증발가스 재액화 장치 및 방법{Device and method of re-liquefying boil-off gas}BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a device and method for re-liquefying boil-off gas,

본 발명은 증발가스 재액화 장치 및 방법에 관한 것으로서, 보다 상세하게는 증발가스 재액화를 위한 제어를 보다 간단하게 할 수 있는 증발가스 재액화 장치 및 방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for liquefying an evaporation gas, and more particularly, to an apparatus and a method for liquefying an evaporation gas that can simplify control for evaporating the gas.

해상에서 액화천연가스(Liquefied Natural Gas, 또는 LNG) 및 액화석유가스(Liquefied Petroleum Gas, 또는 LPG) 등의 액화가스를 취급하는 해상 부유물에는 액화가스를 저장하기 위한 저장 탱크가 구비된다.A floating tank for handling liquefied gas such as liquefied natural gas (LNG) or liquefied petroleum gas (LPG) at sea is equipped with a storage tank for storing the liquefied gas.

이러한 저장 탱크에는 저장 탱크 내부와 외부와의 열교환을 차단하기 위한 단열재가 구비되지만 내부와 외부의 완벽한 열교환은 불가능하므로 외부에서 저장 탱크 내부로 열에너지가 전달되고 따라서 저장 탱크 내부에서는 액화가스가 증발하여 발생하는 증발가스(Boil-off Gas)가 발생한다.This storage tank is provided with a thermal insulating material for preventing heat exchange between the inside and the outside of the storage tank. However, since heat exchange between the inside and the outside is impossible, thermal energy is transferred from outside to the storage tank, A boil-off gas is generated.

이러한 증발가스가 저장 탱크 내부에 지속적으로 누적될 경우 저장 탱크의 안정성 등의 문제가 발생할 수 있으므로 액화가스를 취급하는 해상 부유물에는 증발가스를 재액화하기 위한 재액화 장치가 구비되는 경우가 많다.If such evaporation gas is continuously accumulated in the storage tank, there may arise problems such as stability of the storage tank. Therefore, a resolidification device for re-liquefying the evaporation gas is often provided in the floating suspension for handling the liquefied gas.

도 1에는 해상 부유물에 구비되며 증발가스를 재액화하기 위한 재액화 장치의 일 예가 도시되어 있다.Fig. 1 shows an example of a remelting device for resuspension of evaporation gas, which is provided in a floating object.

도 1의 재액화 장치 일 예에 따르면 재액화 장치는, 저장 탱크에서 배출된 증발가스를 압축하기 위한 복수의 압축기(1) 및 증발가스가 복수의 압축기(1)로부터 냉각 유닛(2)에 공급되는 경로 및 재액화 장치를 유동하는 경로를 제공하는 증발가스 유동라인(3)이 도시되어 있다.1, the remelting apparatus includes a plurality of compressors 1 for compressing the evaporated gas discharged from the storage tank and a plurality of compressors 1 for supplying evaporation gas from the plurality of compressors 1 to the cooling unit 2 And a vapor gas flow line 3 that provides a path through which the redistribution device flows.

저장 탱크에서 배출되는 증발가스의 양이 적은 경우에는 복수의 압축기 중 하나의 압축기 또는 일부의 압축기만 가동하여 증발가스를 재액화시키지만 저장 탱크에서 배출되는 증발가스의 양이 많은 경우에는 모든 압축기를 가동하여 증발가스를 재액화시키게 된다.In the case where the amount of evaporated gas discharged from the storage tank is small, only one of the compressors or only a part of the compressors operates to re-liquefy the evaporated gas, but when the amount of evaporated gas discharged from the storage tank is large, Thereby re-liquefying the evaporated gas.

이때, 도 1에 도시된 바와 같이 증발가스 유동라인(3)이 복수의 압축기(1)에서 배출된 증발가스가 혼합되어 냉각 유닛(2)에 공급되도록 구성되는 경우 원활한 증발가스의 재액화가 이루어지도록 하기 위해서는 각각의 복수의 압축기(1)에 동일한 양의 증발가스가 공급되도록 제어할 필요가 있다. 그러나, 이러한 증발가스의 배출량은 저장 탱크 내부의 압력 등에 따라 수시로 변하게 되므로 복수의 압축기(1)에 동일한 양의 증발가스가 실시간으로 공급되도록 제어하는 것이 어렵다는 문제점이 있다.In this case, as shown in FIG. 1, when the evaporation gas flow line 3 is configured such that the evaporation gas discharged from the plurality of compressors 1 is mixed and supplied to the cooling unit 2, It is necessary to control so that the same amount of evaporation gas is supplied to each of the plurality of compressors 1. However, since the discharge amount of the evaporated gas varies from time to time according to the pressure inside the storage tank, it is difficult to control the same amount of evaporated gas to be supplied to the plurality of compressors 1 in real time.

따라서, 본 발명의 목적은 증발가스의 재액화를 위해 복수의 압축기에 동일한 양의 증발가스가 공급되도록 제어하지 않더라도 원활한 증발가스 재액화 성능을 발휘할 수 있는 증발가스 재액화 장치 및 방법을 제공하는 데 있다.Accordingly, an object of the present invention is to provide an evaporation-gas re-liquefying apparatus and method capable of exhibiting smooth liquefaction performance of evaporation gas without controlling the same amount of evaporation gas to be supplied to a plurality of compressors for re-liquefaction of the evaporation gas have.

상기 목적을 달성하기 위한 본 발명의 일 측면에 따르면, 액화가스를 저장하는 저장 탱크로부터 배출되는 증발가스를 재액화하기 위한 장치에 있어서, 상기 증발가스를 압축하기 위해 병렬로 구비된 복수의 압축기; 상기 복수의 압축기에서 배출되는 증발가스를 재액화하기 위한 냉각 유닛; 및 상기 증발가스가 상기 복수의 압축기로부터 상기 냉각 유닛에 공급되는 경로 및 상기 냉각 유닛을 유동하는 경로를 제공하는 복수의 증발가스 유동라인; 을 포함하며, 상기 증발가스 유동라인 각각은 상기 복수의 압축기에서 배출된 증발가스가 증발가스를 재액화하기 위한 장치 내에서 서로 혼합되지 않도록 독립적으로 배치되는 증발가스 재액화 장치가 제공된다.According to an aspect of the present invention, there is provided an apparatus for re-liquefying an evaporated gas discharged from a storage tank storing a liquefied gas, the apparatus comprising: a plurality of compressors provided in parallel to compress the evaporated gas; A cooling unit for re-liquefying the evaporated gas discharged from the plurality of compressors; And a plurality of evaporation gas flow lines providing a path through which the evaporation gas is supplied from the plurality of compressors to the cooling unit and a path through which the cooling unit flows; Wherein each of the evaporation gas flow lines is independently arranged so that the evaporation gases discharged from the plurality of compressors are not mixed with each other in an apparatus for resupplying the evaporation gas.

상기 복수의 압축기는 제1 압축기 및 제2 압축기를 포함할 수 있다.The plurality of compressors may include a first compressor and a second compressor.

상기 제2 압축기는 상기 제1 압축기에 대한 리던던시(Redundancy) 압축기일 수 있다.The second compressor may be a redundancy compressor for the first compressor.

상기 냉각 유닛은 상기 복수의 압축기에서 배출된 증발가스와 상기 저장 탱크에서 배출된 증발가스를 열교환하여 상기 복수의 압축기에서 배출된 증발가스를 냉각하는 열교환기; 를 포함할 수 있다.Wherein the cooling unit includes: a heat exchanger for exchanging heat between the evaporated gas discharged from the plurality of compressors and the evaporated gas discharged from the storage tank to cool the evaporated gas discharged from the plurality of compressors; . ≪ / RTI >

상기 냉각 유닛은 상기 압축기 및 상기 열교환기를 거쳐 배출된 증발가스를 감압하여 팽창시키기 위한 팽창 수단; 을 더 포함할 수 있다.The cooling unit includes expansion means for decompressing and expanding the evaporated gas discharged through the compressor and the heat exchanger; As shown in FIG.

상기 냉각 유닛은 상기 증발가스로부터 상기 팽창 수단을 거쳐 생성된 기액 혼합물을 기체와 액체로 분리하기 위한 기액 분리기; 를 더 포함할 수 있다.Wherein the cooling unit comprises a gas-liquid separator for separating the gas-liquid mixture produced from the evaporated gas through the expansion means into a gas and a liquid; As shown in FIG.

상기 목적을 달성하기 위한 본 발명의 다른 측면에 따르면, 액화가스를 저장하는 저장 탱크로부터 배출되는 증발가스를 재액화하기 위한 방법에 있어서, 병렬로 구비된 복수의 압축기를 통해 상기 증발가스를 압축하는, 압축 단계; 및 냉각 유닛에 의해 상기 압축된 증발가스를 재액화하는, 냉각 단계; 를 포함하며, 상기 증발가스가 상기 복수의 압축기로부터 상기 냉각 유닛에 공급되는 경로 및 상기 냉각 유닛을 유동하는 경로를 제공하는 복수의 증발가스 유동라인 각각은 상기 복수의 압축기에서 배출된 증발가스가 증발가스를 재액화하기 위한 장치 내에서 서로 혼합되지 않도록 독립적으로 배치되는 증발가스 재액화 방법이 제공된다.According to another aspect of the present invention, there is provided a method for re-liquefying an evaporated gas discharged from a storage tank storing a liquefied gas, the method comprising: compressing the evaporated gas through a plurality of compressors provided in parallel; , A compression step; And a cooling unit for re-liquefying the compressed evaporated gas by a cooling unit; Wherein each of the plurality of evaporation gas flow lines providing a path through which the evaporation gas is supplied from the plurality of compressors to the cooling unit and a path through which the cooling unit flows, There is provided an evaporation gas remelting method which is independently arranged so as not to be mixed with each other in an apparatus for resuspension of a gas.

상기 복수의 압축기는 제1 압축기 및 제2 압축기를 포함할 수 있다.The plurality of compressors may include a first compressor and a second compressor.

상기 제2 압축기는 상기 제1 압축기에 대한 리던던시(Redundancy) 압축기일 수 있다.The second compressor may be a redundancy compressor for the first compressor.

상기 냉각 단계는 상기 복수의 압축기에서 배출된 증발가스와 상기 저장 탱크에서 배출된 증발가스를 열교환하여 상기 복수의 압축기에서 배출된 증발가스를 냉각하는 단계; 를 포함할 수 있다.Cooling the evaporated gas discharged from the plurality of compressors by exchanging heat between the evaporated gas discharged from the plurality of compressors and the evaporated gas discharged from the storage tank; . ≪ / RTI >

상기 냉각 단계는 상기 압축기 및 상기 열교환기를 거쳐 배출된 증발가스를 감압하여 팽창시키는 단계; 를 더 포함할 수 있다.Expanding the evaporated gas discharged through the compressor and the heat exchanger by reducing the pressure; As shown in FIG.

상기 냉각 단계는 상기 증발가스로부터 상기 팽창 수단을 거쳐 생성된 기액 혼합물을 기체와 액체로 분리하는 단계; 를 더 포함할 수 있다.Separating the gas-liquid mixture produced from the evaporated gas through the expansion means into a gas and a liquid; As shown in FIG.

본 발명에 따르면 증발가스의 재액화를 위해 복수의 압축기에 동일한 양의 증발가스가 공급되도록 제어하지 않더라도 원활한 증발가스 재액화 성능을 발휘할 수 있다.According to the present invention, even when the same amount of evaporative gas is not supplied to a plurality of compressors in order to re-liquefy the evaporated gas, a smooth evaporative gas re-liquefaction performance can be exhibited.

도 1은 해상 부유물에 구비되며 증발가스를 재액화하기 위한 재액화 장치의 일 예를 도시한 도면이다.
도 2는 본 발명의 일 실시예에 따른 증발가스 재액화 장치의 구성도이다.1 is a view showing an example of a remelting device for resuspension of evaporation gas, which is provided in a floating object.
2 is a configuration diagram of an evaporation gas remelting apparatus according to an embodiment of the present invention.

이하 첨부한 도면을 참조하여 본 발명의 바람직한 실시예에 대한 구성을 상세히 설명하면 다음과 같다. 본 발명은 도면에 도시된 실시예를 참고로 설명될 것이나, 이는 예시적인 것에 불과하며 당해 기술 분야에서 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 실시예가 가능하다는 점을 이해할 것이다. 따라서 본 발명의 진정한 보호 범위는 첨부된 특허청구범위에 의해서만 정해져야 할 것이다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention will be described with reference to the embodiments shown in the drawings, but it is to be understood that various modifications and equivalent embodiments may be made by those skilled in the art without departing from the scope of the present invention. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

한편, 본 발명은 액화가스를 저장하기 위한 액화가스 저장 탱크를 구비한 해상 부유물에 적용될 수 있다.On the other hand, the present invention can be applied to a marine suspended body having a liquefied gas storage tank for storing liquefied gas.

또한, 본 명세서에서 사용되는 액화가스(Liquefied Gas)는 액화천연가스(Liquefied Natural Gas) 및 액화석유가스(Liquefied Petroleum Gas)를 포함하는 의미로 해석되어야 할 것이다.In addition, the liquefied gas used in the present specification should be interpreted to include a liquefied natural gas and a liquefied petroleum gas.

도 2는 본 발명의 일 실시예에 따른 증발가스 재액화 장치의 구성도이다.2 is a configuration diagram of an evaporation gas remelting apparatus according to an embodiment of the present invention.

도 2에 따른 본 발명의 일 실시예에 따른 증발가스 재액화 장치는, 복수의 압축기(12, 14)를 포함한다. 복수의 압축기(12, 14)는 병렬로 구비된다. 본 발명의 일 실시예에 따른 압축기(12, 14)는 액화가스를 저장하는 저장 탱크로부터 배출되는 증발가스를 압축하는 역할을 수행한다. 본 실시예에서는 압축기가 두 개인 경우를 도시하고 있지만 압축기의 개수는 단순히 예시적인 것에 불과하며 압축기는 세개 이상일 수 있다.The apparatus for liquefying vaporized gas according to one embodiment of the present invention as shown in Fig. 2 includes a plurality of compressors 12, 14. A plurality of compressors (12, 14) are provided in parallel. The compressors 12 and 14 according to the embodiment of the present invention compress the evaporated gas discharged from the storage tank storing the liquefied gas. Although the present embodiment shows the case where there are two compressors, the number of compressors is merely an example, and the number of compressors may be three or more.

본 발명의 일 실시예에 따르면 압축기는 제1 압축기(12) 및 제2 압축기(14)를 포함할 수 있다.According to an embodiment of the present invention, the compressor may include a first compressor (12) and a second compressor (14).

해상 부유물에 구비되는 구성 중 일부가 고장나는 등의 이유로 정상적으로 작동하지 않는 경우에 대비하여 동일한 역할을 수행할 수 있는 구성을 추가적으로 구비하도록 설계하는 경우가 있는데 이러한 설계를 리던던시(Redundancy) 설계라고 한다. 리던던시 설계를 통해 해상 부유물의 구성 중 일부가 정상적으로 작동하지 않는 경우 리던던시 구성이 작동되도록 함으로써 해상 부유물의 원활한 작업 수행이 가능하도록 할 수 있다.There is a case where a structure that can perform the same role can be additionally provided in case that a part of the structure provided in the floating body is not operated normally due to failure or the like. Such a design is called a redundancy design. The redundancy design allows the redundancy configuration to be activated when some of the configuration of the marine suspension is not working normally, thereby enabling smooth operation of the marine suspension.

본 발명의 일 실시예에 따르면 제2 압축기(14)는 제1 압축기(12)의 이러한 리던던시 압축기일 수 있다. 이러한 경우 제1 압축기(12)가 정상적으로 작동하지 않는 경우 제2 압축기(14)가 제1 압축기(12)의 역할을 대신하여 저장 탱크로부터 배출되는 증발가스를 압축할 수 있다. 또한, 제2 압축기(14)는 제1 압축기(12)가 정상적으로 작동하는 경우에도 작동할 수 있는데 예를 들어, 저장 탱크로부터 배출되는 증발가스의 양이 제1 압축기(12)가 압축할 수 있는 증발가스의 양을 초과하는 경우에도 증발가스를 압축하기 위해 작동할 수 있다. 이 경우, 제1 압축기(12)의 용량을 증가시키지 않더라도 리던던시 압축기인 제2 압축기(14)를 이용해 증발가스를 압축할 수 있으므로 해상 부유물에 설치되는 압축기의 용량을 줄일 수 있어 해상 부유물의 건조 비용을 줄일 수 있고 압축기의 설치 공간을 감축할 수 있는 효과가 발생한다.According to an embodiment of the present invention, the second compressor 14 may be such a redundant compressor of the first compressor 12. In this case, when the first compressor 12 does not operate normally, the second compressor 14 can compress the evaporated gas discharged from the storage tank on behalf of the first compressor 12. The second compressor 14 may also operate when the first compressor 12 is operating normally, for example, when the amount of evaporative gas exiting the storage tank is greater than the amount of evaporative gas that the first compressor 12 can compress Even when the amount of the evaporated gas is exceeded, it can operate to compress the evaporated gas. In this case, since evaporative gas can be compressed using the second compressor 14, which is a redundant compressor, without increasing the capacity of the first compressor 12, the capacity of the compressor installed in the floating suspension can be reduced, And the installation space of the compressor can be reduced.

계속해서 도 2를 참조하면, 본 발명의 일 실시예에 따른 증발가스 재액화 장치는 압축기(12, 14)에서 압축된 후 배출된 증발가스를 냉각 및 재액화시키기 위한 냉각 유닛(100)을 포함한다. 냉각 유닛(100)에서는 저장 탱크(5)에서 배출된 증발가스의 냉열을 회수하여 압축기(12, 14)에서 배출된 증발가스를 냉각시킬 수 있다.2, the apparatus for liquefying evaporated gas according to an embodiment of the present invention includes a cooling unit 100 for cooling and re-liquefying evaporated gas discharged after compressed by compressors 12 and 14 do. In the cooling unit 100, the cold heat of the evaporated gas discharged from the storage tank 5 can be recovered to cool the evaporated gas discharged from the compressors 12 and 14.

이를 위하여, 냉각 유닛(100)은, 저장 탱크(5)에서 배출된 증발가스와 압축기(12, 14)에서 배출된 증발가스를 열교환시켜 압축기(12, 14)에서 배출된 증발가스를 냉각시키는 열교환기(102), 열교환기(102)에서 냉각된 후 배출된 증발가스를 감압하여 팽창시켜 증발가스로부터 기액 혼합물이 생성되도록 하는 팽창 수단(104, 106), 및 팽창 수단(104, 106)에서 배출된 기액 혼합물을 기체와 액체로 분리시키는 기액 분리기(108)를 포함한다. 전술한 바와 같이 도 2에 따르면 압축기가 두개 설치되어 있는데 이에 대응하여 팽창 수단은 제1 압축기(12)에서 배출된 증발가스를 팽창시키는 제1 팽창 수단(104) 및 제2 압축기(14)에서 배출된 증발가스를 팽창시키는 제2 팽창 수단(106)을 포함할 수 있다. 압축기 개수의 경우와 유사하게 도 2에 도시된 팽창 수단의 개수 역시 예시적인 것에 불과하며 압축기의 개수가 변함에 따라 팽창 수단의 개수 역시 가변적일 수 있다. 한편, 팽창 수단은 팽창 밸브일 수 있으며, 예를 들어 Joule-Thomson 밸브일 수 있다.For this purpose, the cooling unit 100 is provided with a heat exchanger (not shown) for exchanging heat between the evaporated gas discharged from the storage tank 5 and the evaporated gas discharged from the compressors 12, 14 to cool the evaporated gas discharged from the compressors 12, Expansion means (104, 106) for decompressing and expanding the evaporated gas that has been cooled after being cooled in the heat exchanger (102) to produce a vapor-liquid mixture from the evaporated gas, And a gas-liquid separator 108 for separating the gas-liquid mixture into gas and liquid. As described above, according to FIG. 2, two compressors are provided. In response to this, the expansion means includes a first expansion means 104 for expanding the evaporation gas discharged from the first compressor 12, and a second expansion means And a second expansion means (106) for expanding the evaporated gas. Similar to the case of the number of compressors, the number of expansion means shown in FIG. 2 is also only exemplary, and the number of expansion means can also be variable as the number of compressors varies. On the other hand, the expansion means may be an expansion valve, for example a Joule-Thomson valve.

한편, 기액 분리기(108)에서 분리된 액체는 다시 액화가스 저장 탱크(5)에 공급될 수 있으며, 기액 분리기(108)에서 분리된 기체는 저장 탱크(5)에서 배출된 증발가스에 합류한 후 열교환기(102)에 공급되어 압축기(12, 14)에서 배출된 증발가스를 냉각시킬 수 있다.On the other hand, the liquid separated in the gas-liquid separator 108 can be supplied to the liquefied gas storage tank 5 again, and the gas separated in the gas-liquid separator 108 joins the evaporated gas discharged from the storage tank 5 And is supplied to the heat exchanger 102 to cool the evaporated gas discharged from the compressors 12 and 14. [

한편, 저장 탱크에서 배출된 증발가스를 압축기에 공급하고, 압축기에서 배출된 증발가스를 냉각 유닛에 공급하기 위해서는 증발가스가 유동할 수 있는 라인이 필요한데 이를 위하여 본 발명의 일 실시예에 따르면 증발가스 유동라인(22, 24)이 구비된다.Meanwhile, in order to supply the evaporated gas discharged from the storage tank to the compressor and supply the evaporated gas discharged from the compressor to the cooling unit, a line through which the evaporated gas can flow is required. To this end, Flow lines 22 and 24 are provided.

전술한 바와 같이 본 발명의 일 실시예에 따르면 압축기가 복수로 구비되는데 각각의 압축기에서 배출된 증발가스는 각각의 증발가스 유동라인을 통해 냉각 유닛에 공급되고 냉각 유닛에 공급된 증발가스는 각각의 증발가스 유동라인을 통해 냉각 유닛 내의 열교환기, 팽창 수단, 및 기액 분리기를 거치며 재액화된다. 도 2에 도시된 바와 같이 각각의 증발가스 유동라인을 통해 유동하는 증발가스는 하나의 열교환기(102)에 공급될 수 있다.As described above, according to an embodiment of the present invention, a plurality of compressors are provided. The evaporation gas discharged from each compressor is supplied to the cooling unit through each of the evaporation gas flow lines, and the evaporation gas supplied to the cooling unit Through the evaporating gas flow line, through the heat exchanger, the expansion means, and the gas-liquid separator in the cooling unit. As shown in FIG. 2, the evaporative gas flowing through each of the evaporative gas flow lines may be supplied to one heat exchanger 102.

본 발명의 일 실시예에 따르면 증발가스 유동라인(22, 24)는 각각의 증발가스 유동라인(22, 24)을 유동하는 증발가스가 본 발명의 일 실시예에 따른 재액화 장치 내에서 서로 혼합되지 않도록 독립적으로 구비된다. 즉, 두개의 압축기(12, 14)가 구비된 도 2를 참조하여 설명하면, 제1 압축기(12)에서 압축된 증발가스는 제1 증발가스 유동라인(22)을 통해 냉각 유닛(100)에 공급된다. 냉각 유닛(100)에 공급된 증발가스는 다시 제1 증발가스 유동라인(22)을 통해 열교환기(102), 제1 팽창 수단(104) 및 기액 분리기(108)를 통하여 재액화된다. 또한, 제2 압축기(14)에서 압축된 증발가스는 제2 증발가스 유동라인(24)을 통해 냉각 유닛(100)에 공급되고, 냉각 유닛(100)에 공급된 증발가스는 다시 제1 증발가스 유동라인(22)을 통해 열교환기(102), 제2 팽창 수단(106) 및 기액 분리기를 통하여 재액화된다. 이러한 재액화 과정에서 제1 증발가스 유동라인(22) 및 제2 증발가스 유동라인(24)을 각각 유동하는 증발가스는 재액화 장치를 유동하는 동안 서로 혼합되지 않는다.According to one embodiment of the present invention, the evaporation gas flow lines 22, 24 are configured such that the evaporating gases flowing through each of the evaporation gas flow lines 22, 24 are mixed with one another in the re-liquefier device according to an embodiment of the present invention Respectively. 2, in which the two compressors 12 and 14 are provided, the evaporated gas compressed in the first compressor 12 is supplied to the cooling unit 100 through the first evaporative gas flow line 22 . The evaporated gas supplied to the cooling unit 100 is again liquefied through the heat exchanger 102, the first expansion means 104 and the gas-liquid separator 108 through the first evaporative gas flow line 22. The evaporated gas compressed in the second compressor 14 is supplied to the cooling unit 100 through the second evaporated gas flow line 24 and the evaporated gas supplied to the cooling unit 100 is again supplied to the first evaporated gas And is re-liquefied through the heat exchanger 102, the second expansion means 106 and the gas-liquid separator through the flow line 22. In this re-liquefaction process, the evaporated gases flowing through the first evaporative gas flow line 22 and the second evaporative gas flow line 24, respectively, are not mixed with each other while flowing through the re-liquefier.

한편, 전술한 바와 같이 압축기의 개수는 가변적이므로 각각의 압축기에서 배출되는 증발가스가 독립적으로 유동되도록 하기 위한 증발가스 유동라인 역시 가변적일 수 있다. 따라서, 압축기의 개수가 두개를 초과하는 경우 증발가스 유동라인 역시 그에 따라 두개를 초과할 수 있으며, 이 경우에도 증발가스 유동라인은 각각의 증발가스 유동라인을 유동하는 증발가스가 재액화 장치 내에서 서로 혼합되지 않도록 독립적으로 구비될 수 있다.Meanwhile, since the number of compressors is variable as described above, the evaporation gas flow line for allowing the evaporation gas discharged from each compressor to flow independently may also be variable. Thus, if the number of compressors exceeds two, the evaporation gas flow line may also exceed two accordingly, in which case the evaporation gas flow lines are also arranged such that the evaporation gas flowing through each evaporation gas flow line, They can be independently provided so as not to be mixed with each other.

전술한 바와 같이 복수의 압축기에서 배출되는 증발가스를 혼합한 후 하나의 유체로서 냉각 유닛(즉, 열교환기)에 공급하는 경우 복수의 압축기에 공급되는 증발가스의 양이 골고루 분배되도록 제어할 필요가 있다. 그러나, 저장 탱크에서 배출되는 증발가스의 양은 저장 탱크 내부의 상태에 따라 실시간으로 변하므로 복수의 압축기에 공급되는 증발가스의 양을 골고루 분배하도록 제어하는 것은 어렵고 복잡하다는 문제점이 있다.As described above, when the evaporation gas discharged from a plurality of compressors is mixed and then supplied to a cooling unit (i.e., a heat exchanger) as one fluid, it is necessary to control so that the amount of the evaporation gas supplied to the plurality of compressors is uniformly distributed have. However, since the amount of the evaporated gas discharged from the storage tank changes in real time according to the state inside the storage tank, it is difficult and complicated to control the distribution of the amount of the evaporated gas supplied to the plurality of compressors evenly.

그러나, 본 발명에 따르면 복수의 압축기에서 배출되는 증발가스를 혼합시키지 않고 각각 독립적으로 구비된 증발가스 유동라인을 통해 냉각 유닛(즉, 열교환기)에 공급하도록 함으로써, 복수의 압축기에 공급되는 증발가스의 양을 골고루 분배하도록 제어하지 않더라도 증발가스의 재액화가 원활하게 이루어질 수 있다는 기술적 효과가 존재한다.However, according to the present invention, by supplying the evaporation gas discharged from the plurality of compressors to the cooling unit (that is, the heat exchanger) through the independently provided evaporative gas flow lines independently of each other, There is a technical effect that the re-circulation of the evaporation gas can be smoothly performed even if the amount of the evaporation gas is not controlled to be distributed evenly.

또한, 본 발명에 따르면 저장 탱크에서 배출되는 증발가스의 양이 많은 경우 리던던시 압축기를 구동하여 증발가스를 재액화할 수 있으므로 해상 부유물에 설치되는 압축기의 용량을 줄일 수 있어 해상 부유물의 건조 비용을 감축할 수 있고 압축기 설치에 필요한 물리적인 공간을 감축할 수 있다는 기술적 효과 역시 존재한다.Further, according to the present invention, when the amount of evaporated gas discharged from the storage tank is large, the evaporative gas can be re-liquefied by driving the redundant compressor, so that the capacity of the compressor installed in the floating suspension can be reduced, There is also a technical effect of being able to reduce the physical space required to install the compressor.

1 - 압축기
2 - 냉각 유닛
3 - 증발가스 유동라인
5 - 저장 탱크
12 - 제1 압축기
14 - 제2 압축기
22 - 제1 증발가스 유동라인
24 - 제2 증발가스 유동라인
100 - 냉각 유닛
102 - 열교환기
104 - 제1 팽창 수단
106 - 제2 팽창 수단
108 - 기액 분리기1 - compressor
2 - cooling unit
3 - Evaporative gas flow line
5 - Storage tank
12 - first compressor
14 - the second compressor
22 - the first evaporative gas flow line
24 - second evaporative gas flow line
100 - cooling unit
102 - Heat Exchanger
104 - first expansion means
106 - a second expansion means
108 - gas-liquid separator

Claims (12)

액화가스를 저장하는 저장 탱크로부터 배출되는 증발가스를 재액화하기 위한 장치에 있어서,
상기 증발가스를 압축하기 위해 병렬로 구비된 복수의 압축기;
상기 복수의 압축기에서 배출되는 증발가스를 재액화하기 위한 냉각 유닛; 및
상기 증발가스가 상기 복수의 압축기로부터 상기 냉각 유닛에 공급되는 경로 및 상기 냉각 유닛을 유동하는 경로를 제공하는 복수의 증발가스 유동라인; 을 포함하며,
상기 증발가스 유동라인 각각은 상기 복수의 압축기에서 배출된 증발가스가 증발가스를 재액화하기 위한 장치 내에서 서로 혼합되지 않도록 독립적으로 배치되는,
증발가스 재액화 장치.An apparatus for re-liquefying vaporized gas discharged from a storage tank for storing a liquefied gas,
A plurality of compressors provided in parallel for compressing the evaporated gas;
A cooling unit for re-liquefying the evaporated gas discharged from the plurality of compressors; And
A plurality of evaporation gas flow lines providing a path through which the evaporation gas is supplied from the plurality of compressors to the cooling unit and a path through which the cooling unit flows; / RTI >
Each of said evaporation gas flow lines being independently arranged so that the evaporation gases discharged from said plurality of compressors are not mixed with each other in an apparatus for resupplying evaporation gas,
Evaporating gas remelting device. 청구항 1에 있어서,
상기 복수의 압축기는,
제1 압축기 및 제2 압축기를 포함하는,
증발가스 재액화 장치.The method according to claim 1,
Wherein the plurality of compressors comprise:
A compressor comprising a first compressor and a second compressor,
Evaporating gas remelting device. 청구항 2에 있어서,
상기 제2 압축기는 상기 제1 압축기에 대한 리던던시(Redundancy) 압축기인,
증발가스 재액화 장치.The method of claim 2,
Wherein the second compressor is a redundancy compressor for the first compressor,
Evaporating gas remelting device. 청구항 1에 있어서,
상기 냉각 유닛은,
상기 복수의 압축기에서 배출된 증발가스와 상기 저장 탱크에서 배출된 증발가스를 열교환하여 상기 복수의 압축기에서 배출된 증발가스를 냉각하는 열교환기; 를 포함하는,
증발가스 재액화 장치.The method according to claim 1,
The cooling unit includes:
A heat exchanger for exchanging heat between the evaporated gas discharged from the plurality of compressors and the evaporated gas discharged from the storage tank to cool the evaporated gas discharged from the plurality of compressors; / RTI >
Evaporating gas remelting device. 청구항 4에 있어서,
상기 냉각 유닛은,
상기 압축기 및 상기 열교환기를 거쳐 배출된 증발가스를 감압하여 팽창시키기 위한 팽창 수단; 을 더 포함하는,
증발가스 재액화 장치.The method of claim 4,
The cooling unit includes:
Expansion means for decompressing and expanding the evaporated gas discharged through the compressor and the heat exchanger; ≪ / RTI >
Evaporating gas remelting device. 청구항 5에 있어서,
상기 냉각 유닛은,
상기 증발가스로부터 상기 팽창 수단을 거쳐 생성된 기액 혼합물을 기체와 액체로 분리하기 위한 기액 분리기; 를 더 포함하는,
증발가스 재액화 장치.The method of claim 5,
The cooling unit includes:
A gas-liquid separator for separating the vapor-liquid mixture produced from the evaporated gas through the expansion means into a gas and a liquid; ≪ / RTI >
Evaporating gas remelting device. 액화가스를 저장하는 저장 탱크로부터 배출되는 증발가스를 재액화하기 위한 방법에 있어서,
병렬로 구비된 복수의 압축기를 통해 상기 증발가스를 압축하는, 압축 단계; 및
냉각 유닛에 의해 상기 압축된 증발가스를 재액화하는, 냉각 단계; 를 포함하며,
상기 증발가스가 상기 복수의 압축기로부터 상기 냉각 유닛에 공급되는 경로 및 상기 냉각 유닛을 유동하는 경로를 제공하는 복수의 증발가스 유동라인 각각은 상기 복수의 압축기에서 배출된 증발가스가 증발가스를 재액화하기 위한 장치 내에서 서로 혼합되지 않도록 독립적으로 배치되는,
증발가스 재액화 방법.A method for re-liquefying a vaporized gas discharged from a storage tank for storing a liquefied gas,
Compressing the evaporating gas through a plurality of compressors provided in parallel; And
A cooling step of re-liquefying the compressed evaporated gas by a cooling unit; / RTI >
Wherein each of the plurality of evaporation gas flow lines providing the path through which the evaporation gas is supplied from the plurality of compressors to the cooling unit and the path through which the cooling unit flows is formed by the evaporation gas discharged from the plurality of compressors, Wherein the first and second components are arranged independently from one another in the apparatus for &
Evaporation gas re-liquefaction method. 청구항 7에 있어서,
상기 복수의 압축기는,
제1 압축기 및 제2 압축기를 포함하는,
증발가스 재액화 방법.The method of claim 7,
Wherein the plurality of compressors comprise:
A compressor comprising a first compressor and a second compressor,
Evaporation gas re-liquefaction method. 청구항 8에 있어서,
상기 제2 압축기는 상기 제1 압축기에 대한 리던던시(Redundancy) 압축기인,
증발가스 재액화 방법.The method of claim 8,
Wherein the second compressor is a redundancy compressor for the first compressor,
Evaporation gas re-liquefaction method. 청구항 7에 있어서,
상기 냉각 단계는,
상기 복수의 압축기에서 배출된 증발가스와 상기 저장 탱크에서 배출된 증발가스를 열교환하여 상기 복수의 압축기에서 배출된 증발가스를 냉각하는 단계; 를 포함하는,
증발가스 재액화 방법.The method of claim 7,
The cooling step includes:
Exchanging heat between the evaporated gas discharged from the plurality of compressors and the evaporated gas discharged from the storage tank to cool the evaporated gas discharged from the plurality of compressors; / RTI >
Evaporation gas re-liquefaction method. 청구항 10에 있어서,
상기 냉각 단계는,
상기 압축기 및 상기 열교환기를 거쳐 배출된 증발가스를 감압하여 팽창시키는 단계; 를 더 포함하는,
증발가스 재액화 방법.The method of claim 10,
The cooling step includes:
Decompressing and expanding the evaporated gas discharged through the compressor and the heat exchanger; ≪ / RTI >
Evaporation gas re-liquefaction method. 청구항 11에 있어서,
상기 냉각 단계는,
상기 증발가스로부터 상기 팽창 수단을 거쳐 생성된 기액 혼합물을 기체와 액체로 분리하는 단계; 를 더 포함하는,
증발가스 재액화 방법.The method of claim 11,
The cooling step includes:
Separating the gas-liquid mixture produced from the evaporated gas through the expansion means into a gas and a liquid; ≪ / RTI >
Evaporation gas re-liquefaction method.
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